Power recliner

Abstract

The present disclosure provides a power recliner including a seatback having an angle that is adjusted when an external gear coupled to an accommodation groove of an internal gear is eccentrically rotated as wedges are operated, in which a support groove having a level difference is formed in the accommodation groove of the internal gear and maintains a predetermined radius based on a burring part, in which the wedges are installed and inserted into the support groove so as to be moved along the support groove, and in which when a load is applied to a seatback, the wedges are dually in contact with a cam and an inner stepped surface of the support groove or dually in contact with the burring part of the internal gear and the inner stepped surface of the support groove to disperse the load, thereby improving maximum strength of the recliner.

What is claimed is: 
     
       1. A power recliner comprising a seatback having an angle that is adjusted when an external gear coupled to an accommodation groove of an internal gear is eccentrically rotated as wedges are operated by a rotation of a lever socket,
 wherein a support groove having a depth difference with an inner surface of the accommodation groove is formed in the accommodation groove of the internal gear and maintains a predetermined radius based on a burring part, 
 wherein support protrusions of the wedges are installed and inserted into the support groove so as to be moved along the support groove, and 
 wherein when a load is applied to a seatback, the wedges are dually in contact with a cam and an inner sidewall surface of the support groove or dually in contact with the burring part of the internal gear and the inner sidewall surface of the support groove to disperse the load. 
 
     
     
       2. The power recliner of  claim 1 , wherein the power recliner comprises:
 the internal gear comprising the burring part protruding at a center thereof, internal teeth formed on an inner circumferential surface of the accommodation groove, and the support groove formed at a predetermined depth in the inner surface of the accommodation groove so as to be positioned between the burring part and the internal teeth; 
 the cam installed with one side being in contact with the burring part of the internal gear; 
 the external gear eccentrically inserted into the accommodation groove of the internal gear and having a press-fitted bearing and external teeth formed on an outer circumferential surface thereof and having one side engaging with the internal teeth of the internal gear; 
 the pair of wedges disposed between the cam and the bearing of the external gear and installed such that the support protrusions are inserted into the support groove of the internal gear; and 
 the lever socket configured to rotate the wedges and the cam and having one side fitted into the burring part of the internal gear, 
 wherein when a load is applied to the seatback, the load is dispersed by dual contact and support implemented as one side of the cam is in contact with and supported on the burring part by the wedges and the support protrusions of the wedges are in contact with and supported on one side of the support groove of the internal gear. 
 
     
     
       3. The power recliner of  claim 2 , wherein the wedge comprises:
 a wedge body installed to be positioned between the cam and the bearing; and 
 the support protrusion integrated with the wedge body so as to be inserted into the support groove of the internal gear, 
 wherein the support protrusion is formed on the wedge body, and 
 wherein a width (W 1 ) of the wedge body is larger than a width (W 2 ) of the support protrusion. 
 
     
     
       4. The power recliner of  claim 2 , wherein the wedge comprises:
 a wedge body installed to be positioned between the cam and the bearing; and 
 the support protrusion integrated with the wedge body so as to be inserted into the support groove of the internal gear, 
 wherein the support protrusion is formed on the wedge body, and 
 wherein a width (W 1 ) of the wedge body is smaller than a width (W 2 ) of the support protrusion. 
 
     
     
       5. The power recliner of  claim 2 , wherein the wedge comprises:
 a wedge body installed to be positioned between the cam and the bearing; and 
 the support protrusion integrated with the wedge body so as to be inserted into the support groove of the internal gear, and 
 wherein the support protrusion is formed on the wedge body. 
 
     
     
       6. The power recliner of  claim 5 , wherein the wedge is formed such that a width (W 1 ) of the wedge body is equal to a width (W 2 ) of the support protrusion. 
     
     
       7. The power recliner of  claim 1 , wherein the power recliner comprises:
 the internal gear comprising the burring part protruding at a center thereof, internal teeth formed on an inner circumferential surface of the accommodation groove, and the support groove formed at a predetermined depth in the inner surface of the accommodation groove so as to be positioned between the burring part and the internal teeth; 
 the external gear eccentrically inserted into the accommodation groove of the internal gear and having a press-fitted bearing and external teeth formed on an outer circumferential surface thereof and having one side engaging with the internal teeth of the internal gear; 
 the pair of wedges disposed between the bearing of the external gear and the burring part of the internal gear and installed such that the support protrusions are inserted into the support groove of the internal gear; and 
 the lever socket configured to rotate the wedges and having one side fitted into the burring part of the internal gear, 
 wherein when a load is applied to the seatback, the load is dispersed by dual contact and support implemented as one side of the wedges is in contact with the burring part and the support protrusions of the wedges are in contact with one side of the support groove of the internal gear. 
 
     
     
       8. The power recliner of  claim 7 , wherein the wedge comprises:
 a wedge body installed to be positioned between the bearing and the burring part of the internal gear; and 
 the support protrusion integrated with the wedge body so as to be inserted into the support groove of the internal gear, 
 wherein the support protrusion is formed on the wedge body, and 
 wherein a width (W 1 ) of the wedge body is larger than a width (W 2 ) of the support protrusion. 
 
     
     
       9. The power recliner of  claim 8 , wherein the support groove comprises an outer sidewall surface, and the outer sidewall surface is spaced apart from the support protrusions of the wedges at a predetermined distance so as not to come into contact with the support protrusions,
 wherein the support protrusions are installed and inserted into the support groove of the accommodation groove so as to have a predetermined gap from the inner sidewall surface of the support groove, 
 wherein when the recliner operates, the support protrusions of the wedges operate while maintaining the predetermined gap (G) from the inner sidewall surface of the support groove, and 
 wherein when a load is applied to the recliner, one side of the support protrusions is in contact with and supported on the inner sidewall surface of the support groove. 
 
     
     
       10. The power recliner of  claim 9 , wherein the gap (G) is set within a range of 0.1 to 0.4 mm.